Wind tunnel testing of wings in spin

Adam M. Ragheb, Michael S. Selig

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Experimental data for use in validation of analytical models of spinning aircraft wings is lacking in the literature, and the field of stall/spin research has recently received new legislative attention. There exists a need for experimental data on wings in a stall/spin regime against which new analytical models may be validated. Experimental wind tunnel tests were conducted in the University of Illinois at Urbana-Champaign low-speed low-turbulence wind tunnel to study the aerodynamics of stalled spinning wings. Wings with symmetric airfoils of t=c ≈ 10% and aspect ratios between 1 and 10 were tested at pitch angles of 30, 60, and 90 deg. Additionally, the effects of airfoil shape were investigated by testing wings with symmetric, flat-bottom, and flat-plate airfoils. Results for Reynolds numbers between 3,000 and 25,000 show that CNvalues increased as the aspect ratio increased over the range of spin parameter, ω, values tested. The effect of wing aspect ratio was observed to decrease as the wing pitch angle was increased within the stall regime to 90 deg. No Reynolds number effects were observed over the range of Reynolds numbers tested, and CNwas observed to follow the square of ω within the range of spin parameter values that may be experienced by an aircraft in a stall/spin situation. For high spin parameter values, a change in concavity was observed, indicating the existence of a maximum CN. A maximum CNvalue, which increases with the aspect ratio, was measured for AR= 1 and AR= 2 wings. Flatbottom airfoils exhibited larger CNvalues than symmetric airfoils, but no significant difference was observed between flat-plate and flat-bottom airfoils.

Original languageEnglish (US)
Title of host publication54th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103933
DOIs
StatePublished - 2016
Event54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Publication series

Name54th AIAA Aerospace Sciences Meeting
Volume0

Other

Other54th AIAA Aerospace Sciences Meeting, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

ASJC Scopus subject areas

  • Aerospace Engineering

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